W108 250SE Tranny does't shift - Mercedes-Benz Forum

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post #1 of 14 (permalink) Old 10-29-2011, 01:29 AM Thread Starter
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Date registered: Dec 2009
Vehicle: 1978 W123 300D, 1986 S124 250TD, 1987 W124 300D-T, 1965 W108 250SE, 114 280C, W126 300SDL,W123 300CD
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W108 250SE Tranny does't shift

Hi guys. I have recently restored a W108 250SE with an auto column shift tranny. When i drove it this yesterday for the first time the transmission would not shift to higher gear. Drove it again this morning and no changes.
Any inputs on where to start? Did the fluid and filter replacement already but still the same.
Look underneath, it has 16 bolts on its pan.
Could anyone also give me info how many inches should the front and rear bumpers from the ground be? I think mine sags a litlle on the rear.

TIA
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post #2 of 14 (permalink) Old 10-31-2011, 05:12 AM
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Vehicle: 1967 250SE (W108)
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Is the tranny not shifting at all or do you think it's missing 4th gear? These 4 speeds start in 2nd, so you will only notice two shift points. They shift rather early and will have high rpms at highway speeds, but that's normal. To test it, just start in 2nd and shift manually into 3'rd then 4th.
As for the rear end sagging, are the tires bowed in at the top? If so, it could be the hydro compensator on to of the rear axle has gone.
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post #3 of 14 (permalink) Old 10-31-2011, 06:12 AM Thread Starter
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It doesnt up shift at all from 2nd gear even if i put it at 3 or 4.
The rear wheels are straight. I think the springs or shocks are already worn. Do you have measurements from ground to bumper?
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post #4 of 14 (permalink) Old 10-31-2011, 08:58 AM
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heigth

I measured 15.25 to the bottom center of the rear bumper
and 11.875 to the center of the front bumper.
W108 280SE
I have never replaced a mercedes spring, it is usually something other than springs.

Brian O
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post #5 of 14 (permalink) Old 10-31-2011, 09:15 AM Thread Starter
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I presume your measurement is in inches. So the rear should sit higher than the front.

Hmmm probably the shocks are worn. Looked underneath i couldn't see any spring shims like the one found on 123/124/126.

That was a very big help.

Thanks Brian.
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post #6 of 14 (permalink) Old 11-02-2011, 06:32 PM
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He's right about only noticing two shift points, unless you stand on the kick down switch upon take off. My tranny doesn't shift into 4th until 45 mph. pics?
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post #7 of 14 (permalink) Old 11-02-2011, 09:17 PM
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There should be rubber between tops and bottoms of all springs. Top rear has different sizes and the bottom spring perch has different positions for height and rear caster adjustment.

Brian O
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post #8 of 14 (permalink) Old 11-02-2011, 09:32 PM
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As to the shifting problem: Does your transmission have the vacuum controlled Shift Modulator? If so, you could have a vacuum or adjustment issue.

Depending on your specific set-up, there could also be a mechanical linkage from the throttle linkage to the transmission.

Remember: It's not just a car. It's an Adventure.
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post #9 of 14 (permalink) Old 11-03-2011, 08:36 AM
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The earlier swing axle in the W110/W111 used a horizontal compensating spring. The later W108 used a hydropneumatic compensating spring to keep the rear level when the trunk was loaded. If car still has its stock hydro spring, it is or has gone bad. There is a replacement spring and bracket available to replace the very expensive stock one.

As for the shifting problem, make sure the shift rod bushings are in good shape. They are still available and easily replaced. See the EPC for your car. You will need the body type, 108.012.

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post #10 of 14 (permalink) Old 11-05-2011, 10:43 AM Thread Starter
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Shifter bushings are new. Going to adjust the rods next week. Hope this solves it. And oh, when I re carpeted we forgot to put a hole where the kickdown switch was. Grabbed a blade and made that hole.

My rear suspension isn't pneumatic. Just a regular shock and spring combination.

Rear height is at 16" and front at 18". Something's wrong???
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